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RISS 인기검색어
- 검색키워드
- 저자 : Marei Mostafa I. (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Fast Envelope Estimation Technique for Monitoring Voltage Fluctuations
Mostafa I. Marei,Ramadan El Shatshat 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.4
Voltage quality problems such as voltage sag, swell, flicker, undervoltage, and overvoltage have been of great concern for both utilities and customers over the last decade. In this paper, a new approach based on the H∞ algorithm to monitor voltage disturbances is presented. The key idea of this approach is to estimate the amplitude of the fundamental component of distorted and noisy voltage waveform instantaneously, and then the information can be extracted from the estimated envelope to identify and classify different voltage related power quality problems. The H∞ algorithm is characterized by a fast tracking, unlike that of existing techniques. The H∞ algorithm outperforms the Kalman Filter (KF) by its fast convergence and robust tracking performance against non-Gaussian noise. The paper investigates the effects of various types of noise on the performance of the H∞ algorithm. Digital simulation results confirm the validity and accuracy of the proposed method. The proposed H∞ algorithm is examined by tracking the flicker produced by a resistance welder simulated in the PSCAD/EMTDC package.
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Fast Envelope Estimation Technique for Monitoring Voltage Fluctuations
Marei, Mostafa I.,Shatshat, Ramadan El The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.4
Voltage quality problems such as voltage sag, swell, flicker, undervoltage, and overvoltage have been of great concern for both utilities and customers over the last decade. In this paper, a new approach based on the $H_{\infty}$ algorithm to monitor voltage disturbances is presented. The key idea of this approach is to estimate the amplitude of the fundamental component of distorted and noisy voltage waveform instantaneously, and then the information can be extracted from the estimated envelope to identify and classify different voltage related power quality problems. The $H_{\infty}$ algorithm is characterized by a fast tracking, unlike that of existing techniques. The $H_{\infty}$ algorithm outperforms the Kalman Filter (KF) by its fast convergence and robust tracking performance against non-Gaussian noise. The paper investigates the effects of various types of noise on the performance of the $H_{\infty}$ algorithm. Digital simulation results confirm the validity and accuracy of the proposed method. The proposed $H_{\infty}$ algorithm is examined by tracking the flicker produced by a resistance welder simulated in the PSCAD/EMTDC package.
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Modeling of a Four-Quadrant Switched Reluctance Motor Drive on EMTDC/PSCAD
Ismael El-Samahy,Mostafa I. Marei,Ehab F. El-Saadany 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1
This paper introduces a complete package for SRM drive on Power System Computer-Aided Design / Electromagnetic Transients (PSCAD/EMTDC). A three-phase SRM drive is modeled and simulated on PSCAD. The motor is modeled using an accurate nonlinear analytical model that takes into consideration the machine nonlinearities. A current control algorithm is applied for torque ripple minimization to achieve a smooth output torque which is necessary for high performance applications. The motor drive is tested for four-quadrant operations. The modeled SRM is capable of operating as a motor or generator during clockwise and counterclockwise motions. The proposed package helps in understanding the operational principles of switched reluctance motors, investigating the dynamic characteristics of SRM drives, and achieving a high performance dynamic control task.
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Modeling of a Four-Quadrant Switched Reluctance Motor Drive on EMTDC/PSCAD
El-Samahy, Ismael,Marei, Mostafa I.,El-Saadany, Ehab F. The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.1
This paper introduces a complete package for SRM drive on Power System Computer-Aided Design/Electromagnetic Transients (PSCAD/EMTDC). A three-phase SRM drive is modeled and simulated on PSCAD. The motor is modeled using an accurate nonlinear analytical model that takes into consideration the machine nonlinearities. A current control algorithm is applied for torque ripple minimization to achieve a smooth output torque which is necessary for high performance applications. The motor drive is tested for four-quadrant operations. The modeled SRM is capable of operating as a motor or generator during clockwise and counterclockwise motions. The proposed package helps in understanding the operational principles of switched reluctance motors, investigating the dynamic characteristics of SRM drives, and achieving a high performance dynamic control task.
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Experimental Verification for Active Power Filter based Four-Leg Inverter with SUI-PI Controller
El-sotouhy Mohamed M.,Mansour Ahmed A.,Marei Mostafa I.,Zaki Aziza M.,EL-Sattar Ahmed A. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
Four-leg active power fi lter (4-LAPF) is considered one of the vital active fi lters that are frequently used in industrial applications, especially those that need to be controlled in each phase. In addition to control the neutral current that is created because of unbalanced and non-linear loads. In this paper, the active fi lter is controlled by a proposed control method that can achieve simplicity and intelligence at the same time. The novelty of this paper is simulation and experimental verifi cation for the proposed controller with 4-LAPF. This controller relies on instantaneous reactive power theory, which is used to create the reference currents for the 4-LAPF to inject into the network to mitigate problems associated with unbalanced and non-linear loads. As a result, the supply current is maintained a pure sinusoidal wave. The system is simulated using Matlab/Simulink and experimentally verifi ed. The simulation and experimental results prove the preference of the proposed controller over the conventional proportional-integration controller, where it reduces the total harmonic distortion of the supply current and enhance the power quality.
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Simplified methods of the 3D-SVPWM for four-wire three-leg inverter
Awad, Fathy H.,Mansour, Ahmed A.,Marei, Mostafa I.,El-Sattar, Ahmed A. The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
This paper introduces a novel technique for simplification of a three-dimension space vector pulse width modulation (3D-SVPWM). Conventional SVPWM calculations are based on trigonometric functions or several decomposition matrices. Thus, a very fast embedded controller is needed either for two-dimension space vector pulse width modulation (2D-SVPWM) or 3D-SVPWM. The proposed simplified 3D-SVPWM is dedicated to four-wire three-leg inverters. This technique is based on first-order equations of the curve fitting technique to reduce calculation time. Therefore, this method can be implemented with low memory storage and Central Processing Unit (CPU) capability. In addition, high accuracy can be achieved using higher-order equations. Many approaches are introduced for simplifications. The applications of the proposed simplified 3D-SVPWM method are also provided. Simulation results of the proposed simplified 3D-SVPWM and the conventional 3D-SVPWM are discussed. Finally, the results are verified using a real-time simulator based on Typhoon device (402) as Hardware-In-the-Loop. In addition, the controller of the simplified method is implemented and operated on the C2000 LAUNCHXL-F28379D as a low-cost microcontroller kit.
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